Rolex, Oyster Perpetual Date, Sea Dweller 4000 ft = 1220 m, Superlative Chronometer Officially Certified, case No. 8391119, [..]
Dial, case and movement signed, in very good condition
NOTE: Ref. 16600/16660. This reference replaced reference 1665 in 1986. The primary differences are the 1 mm thick sapphire crystal, second-generation gas escape valve, and unidirectional revolving bezel.